Reference for Pesachim 137:7

ר"ע נמי כי אותביה הזאה דתרומה אותביה שהיא מצוה והיא משום שבות והוא סבר הזאה דפסח קא מותיב ליה

Abaye raised an objection against him: An [adult] uncircumcised person who did not circumcise himself [on the eve of Passover] is punished by kareth: this is the view of R. Eliezer. Now here, though the man himself is unfit, yet he states that he is punished by kareth, which proves that the obligation lies upon him. - Said Rabbah: R. Eliezer holds, One may not slaughter [the Passover] and sprinkle [its blood] for him who is unclean through a reptile,<br>

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